
package com.jzdy.core.controller;

import java.util.List;

import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentActivity;
import android.support.v4.app.FragmentTransaction;
import android.widget.RadioGroup;

public class CoreFragmentTabAdapter implements RadioGroup.OnCheckedChangeListener
{
    private List<Fragment> fragments; // 一个tab页面对应一个Fragment
    private RadioGroup rgs; // 用于切换tab
    private FragmentActivity fragmentActivity; // Fragment所属的Activity
    private int fragmentContentId; // Activity中所要被替换的区域的id
    private int currentTab; // 当前Tab页面索引
    public OnRgsExtraCheckedChangedListener onRgsExtraCheckedChangedListener; // 用于在切换tab时候增加新的功能

    public CoreFragmentTabAdapter(FragmentActivity fragmentActivity, List<Fragment> fragments, int fragmentContentId, RadioGroup rgs)
    {
        this.fragments = fragments;
        this.rgs = rgs;
        this.fragmentActivity = fragmentActivity;
        this.fragmentContentId = fragmentContentId;
        // 默认显示第一页
        FragmentTransaction ft = fragmentActivity.getSupportFragmentManager().beginTransaction();
        ft.add(fragmentContentId, fragments.get(0));
        ft.commit();
        rgs.setOnCheckedChangeListener(this);
    }

    @Override
    public void onCheckedChanged(RadioGroup radioGroup , int checkedId)
    {
        for (int i = 0; i < rgs.getChildCount(); i++)
        {
            if (rgs.getChildAt(i).getId() == checkedId)
            {
                if (fragments.size() > i + 1)
                {
                    Fragment fragment = fragments.get(i);
                    FragmentTransaction ft = obtainFragmentTransaction(i);
                    getCurrentFragment().onPause(); // 暂停当前tab
                    if (fragment.isAdded())
                    {
                        fragment.onResume(); // 启动目标tab的onResume()
                    }
                    else
                    {
                        ft.add(fragmentContentId, fragment);
                    }
                    showTab(i); // 显示目标tab
                    ft.commit();
                }
                // 如果设置了切换tab额外功能功能接口
                if (null != onRgsExtraCheckedChangedListener)
                {
                    onRgsExtraCheckedChangedListener.OnRgsExtraCheckedChanged(radioGroup, checkedId, i);
                }
            }
        }
    }

    /**
     * 切换tab
     * @param idx
     */
    private void showTab(int idx)
    {
        for (int i = 0; i < fragments.size(); i++)
        {
            Fragment fragment = fragments.get(i);
            FragmentTransaction ft = obtainFragmentTransaction(idx);
            if (idx == i)
            {
                ft.show(fragment);
            }
            else
            {
                ft.hide(fragment);
            }
            ft.commit();
        }
        currentTab = idx; // 更新目标tab为当前tab
    }

    /**
     * 获取一个带动画的FragmentTransaction
     * @param index
     * @return
     */
    private FragmentTransaction obtainFragmentTransaction(int index)
    {
        FragmentTransaction ft = fragmentActivity.getSupportFragmentManager().beginTransaction();
        /*// 设置切换动画
        if (index > currentTab)
        {
            ft.setCustomAnimations(R.anim.activity_in_left, R.anim.activity_out_right);
        }
        else
        {
            ft.setCustomAnimations(R.anim.activity_in_right, R.anim.activity_out_left);
        }*/
        return ft;
    }

    public int getCurrentTab()
    {
        return currentTab;
    }

    public Fragment getCurrentFragment()
    {
        return fragments.get(currentTab);
    }

    public OnRgsExtraCheckedChangedListener getOnRgsExtraCheckedChangedListener()
    {
        return onRgsExtraCheckedChangedListener;
    }

    public void setOnRgsExtraCheckedChangedListener(OnRgsExtraCheckedChangedListener onRgsExtraCheckedChangedListener)
    {
        this.onRgsExtraCheckedChangedListener = onRgsExtraCheckedChangedListener;
    }

    /**
     *  切换tab额外功能功能接口
     */
    public static class OnRgsExtraCheckedChangedListener
    {
        public void OnRgsExtraCheckedChanged(RadioGroup radioGroup , int checkedId , int index)
        {
        }
    }
}
